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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036275a9543fb8a2d8cdb93eaf9223ab9074fc9630002929990c0e4f91287def' 
  AND token = 'kenBKZdv/2L4R6tCMzsLEC5z/DG8bYBAMuy1J1CzdZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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