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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2ae573dfaa24156bb3ff2b4c9011dfa0d97afeef3f3b5e879873ef11063ed4' 
  AND token = '5vMIF/7YoBAxE6tX4/zi609zN8UHcMwlm2Ca3ENJNEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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