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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990e434bd7180e38b5aaf68331d527030079431bfbcbb68927621a0123695e65' 
  AND token = 'hJX28P8oo9df4eanJZ5L7Y9PBxdUJH/CE5uhlLrsxM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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