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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cfda550cac41344c69bf9dfc687be252c238560884e4ab8687118e1ace17a5c' 
  AND token = '5o9E3DbHHgDyeJWT10AFp8/3nrgeCnEa3q4GBWTNkxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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