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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef35cc3662868f44753a9acc97158aaf81299854c15ac1c0d58e14a22f2d4e30' 
  AND token = 'Em0M7GyJzN2p/5SnN1L0Es7HNBJRF7Ru6PJl5DMymsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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