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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444ab1913b45f98fba398c1f626bc3a51dc4aa2fdede8216b62a25bc93a3bafd' 
  AND token = '4JvPkzBq8kK2LfawvMU2qjx4b7CMuCdhPt4F+Su+vlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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