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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac5246283de0d5ad23949813b42e2c481f33ea6c77bccdeae247afdbc36453d' 
  AND token = 'cDwRE8UXX972I/o+FH+KWpAQv4feX6C4H6Fm2EgRd3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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