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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e01c64d7c19e09c44fa8d457b534ede01069046a6236c312009465779457108' 
  AND token = 'Y3faMuFvgYz+r7ahCph0MzRmBFogOos/zcooj9EAx+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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