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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd381269b40895a229dd7ea8dcc9a14d5f8a925d5137510344c7f9a361e3faa5c' 
  AND token = 'PbsY9BNe274v85FzD0DvgiH0EZus2s3Y7oYApRcu1dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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