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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ce3d54ea9bb298eea1ec6f791a18637143386edb6dd4336ac79846815044e2' 
  AND token = 'BjQNP+keeUm6qnWDpEQ7qgT/BaJ9aoykuL8yYmY1tno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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