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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80e86cfc44b51bae155d50dbe08c96a2a77a46893cb60504821c5dcbd36f12eb' 
  AND token = 'RAPGMFvt5kOwE5B5uiOPzbLz3hZc4Ck8JZyv6baZd/s=' 
  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"
    }
  }
}