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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ff2f7ad9e4fdeaee17a8709f423c07e54846f049be9b01c12f8cd48942b605' 
  AND token = 'qiO0KsOOze2OR7Rxt33CvxpYhoA6P9L6775QES5np+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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