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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e828d367d637b7136e76617cb8808c09d4532a956c6771deec7f7fb9dd33ffa2' 
  AND token = 'SiiKbQ5bhPoNrnCTxWTEo6iqjP58cRQwjYjq5nUJvFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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