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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6addac0276433223684ba2abd25e618d87b955f8499b05bea20653a9512f144' 
  AND token = '3WcaHkk1qCdpqhhxay4at3TP+hKKqHlyfv+/eItt5L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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