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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f99416ec4754cd87d92997314d3c72fffc8ee4f820f2f2139f372d729aafb0f' 
  AND token = 'q4rd7hG1aKaLCHDigs9aVK6oQxTRq40z4Cno3R7TJTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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