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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d14ceafefdadb640f99da86d0facbf730ff50d88b53ae84b1cf9e1ff36e5a5' 
  AND token = 'hz7asvwoBRM+1n9qBylSqThsCW+ZnmL2S8F02VWjOp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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