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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1514e3afc071022493172881e261572b1d5848c533f58d39d9bc6b8e477ff7' 
  AND token = '0nDI6G21CQ2u4KT0kwgBC3iGtKVWrzgUoZCZ5eu532M=' 
  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"
    }
  }
}