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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ce5d7c6f072bc7a10c2053e0855f03af09a335f5c724ee67d51fa0b439ed58' 
  AND token = 'Qrtca0DkuNV+5fdn/k7F8itsm20L3SeutiW2JMpqtdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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