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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8846d7e436bde8cb3cd6820c582e47d6a71548ae47a158dc4db4a61fb9bd855' 
  AND token = '8nTWG8FobwvUzAU9XtZlxR1RYl2K/cKMpCgsI5mEAzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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