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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee753ef1ba02a86e12c626cbb152a4b38a632a3ccfe579cb7823c9f79acf99ec' 
  AND token = 'lrCCmjPhI8Lt9z/VkgnSJicWEtnlM5n/VdGXzs6rI98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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