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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1d262d3ca22c9a3b60a59f0742f66caf9509b4ae9cff7fa7dec20ac19250e8' 
  AND token = 'Q8q2CKP3thtDW3jRXttuX4kP++WT67e6jCAyfoir2n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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