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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3e046be21a008203bd32a200c7ebc75005cfa1f190c6a315eb19442edb6d1a' 
  AND token = 'n4BySK0FaHqFNOe9jehRl/O/D+xa6qCpEQ7wpnsemx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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