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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6d2b905819f26847407af820e3d8e3660b83631822cd62600749e7587de5e0' 
  AND token = '0PrW9e7bk/snWT9NENM9bfAac5aTHyPmqkjhWf8X+Zg=' 
  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"
    }
  }
}