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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ad3ea538360677a7c5f7831d609bea2d3c262d72148311a6aa6c573d240bee' 
  AND token = 'FwInPN5pCEHEyJa2f97MKGq7TM40BDPJV+7RbMeyuqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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