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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a395401fe96ac85c674de34420bd313feccda2f1f2b6205abfb6d65a3c958f' 
  AND token = 'Q15dIyxZxDgOnQ0AZFTPMTZRC/ZsSzE4SRNfw1Q10Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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