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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27fb0b99364c5763b33e90a890eb923b3e9119cd889041dbe8680282986d3d7' 
  AND token = '6Ci1ZDyiKNxRw/IYV9rdPsrc2SgSp1dLVvBoaDoPWFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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