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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c825af0d4bd1a195ff815bfbf75f7397e7652bc25adb69c9ea4c875da34d62' 
  AND token = '88UyyOonHWZRd0iPCNKERevqT3m4U2I1QPcRIxXnCM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}