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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7e3ff967e211597ecb0c588ac4f7fa55bcb784de13ddd57d1c4551e39fcf5d' 
  AND token = 'rD1UI3qJaFt9HpVjyb+HRy90EjMmf9i4oWJXel8U954=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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