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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c05578686ef9339ab1f1af674ef8e771203b63bcb475f9ed4d40db588e63ec' 
  AND token = 'vPpBG2iI9QavW8CDSnhATA6h0jfoRN5dddZ81uAApSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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