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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50eb6a9519e93f88389d907dee9236395bf7064ac734a999ef093f4d60cb2e7f' 
  AND token = 'xl3rNKGSR7z7yTojaCQC+75zHfIwQDQo28jzZnxPmSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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