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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdd5c226ff9337007b0c9c0b7729e6950b1d571892314d60639c266c1ca2af0' 
  AND token = 'gOJtEu0qgdIZhcZh7Y7/wZDZ00M4PyCVPCubCuJlcVA=' 
  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"
    }
  }
}