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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20d7ba155f3e70eaf03bac7bc2c0af215634e38c4661328b088eb2e549ac2a3' 
  AND token = 'MMLOMWfqFGErXAI0if5dF0gyuN+ysFeO1vKZh/xnSks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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