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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b42e1c4c6b5f7386e0eac26d3915e4ea4c0800bc10a9bb64cb454f55af84d35' 
  AND token = 'q1qxfxhy2R39q0Plolxb79UuBHZ9oucylZj0INbkZLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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