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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da40951904d26b141dfdda22bced52d7428e8f1d2caab8f86944954cb60a26c' 
  AND token = 'HcmsLUFQOUsLPY04sC2mba32dxIi1Ea/xb47TA7B6gc=' 
  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"
    }
  }
}