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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff9c8d8e189be8f5056e71b096d1c75eee2e2aef70a0ac35917bc208ca9d20b' 
  AND token = 'e1Zo2ODndVQslaiCfuvDFPbqYU9Gfisf9xjsQ7LIzwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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