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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9a7f1ade8a62241ba0290867c19bc2a585650c0f867aff97376e08fcc81ca6' 
  AND token = 'CL1IZusqIncpA0emtehO+kjOmk4h3InjCDzXUbqJeoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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