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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48ff7c91618930d3a37a86ef6766a0c8877ed60b2dd0d510a3c49705a0921c9' 
  AND token = 'iiRU4HzQRUrGMt6FNVGL91JiAxXVJWkr1vA4W8tQ0FE=' 
  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"
    }
  }
}