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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4de45396b0286264a58ae010e391b7a8c98077a710e5f9f8a096b6a0395527' 
  AND token = 'F0lQDbaIDSiRh/Dy7nJVsLDi9I2ejCKv8MCdQZPwyV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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