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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ac9e8c91b6291d88ec0e3570716bd2d26864a3f862deb299a7f66be9dac3fd' 
  AND token = 'wV1UcVk2kkhG47EBE38HRJFZXtWJ8rb5jIAIZjTtd4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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