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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dcf4e79ef50519097306c65bc6488a0198ebb42fa7229f0c85b3d5c2788b3b2' 
  AND token = 'iyl5qh0kDBtRAZtE/qK86Q1k1TUTdjK03qQlzlP9HKE=' 
  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"
    }
  }
}