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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eccab99e078e79cd9c012db73713bfa11b2f1826f2258a8ea48a5627cd401983' 
  AND token = 'IHDxhRcUT5YUnbq/R0Jso52KsVD17BZY8r8kbw1v08w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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