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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce86209ffefba2bcae46a80e918f3aef0124118ddc76bb3490edd7862fd9be32' 
  AND token = '1GMb3b1RLYaB5T1d25K37QLMa0dGcvrG8nnKjneU+so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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