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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4726f3161596437e4c62e17455900b5119825cdb7a3ef9f8cee77af3cd23297' 
  AND token = 'UZI+B39c+Zo03Spih1CY8iSLvnEs9/E4j/y5p/szix8=' 
  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"
    }
  }
}