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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5840000f8813db25c511fe8b3dcbbc2e6fa9cd8169f033297128ec60d8b2a0d' 
  AND token = '1OjVLMf9EpFBNXBs3VTjcH2y1if8QBhPdcrX33H1Je0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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