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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22ee48e0f0b4d3c2309f1de6c6726d105f87cc06061b0e1b5e2702b305abae19' 
  AND token = 'sr+7hclhf6t5BFwW1bwur+XWrevS6t8xE8MTfmDU9mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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