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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f75ea481ac661c1a6714e7a919875b7cd701c9df75492abf62f2bbffd5a7a2' 
  AND token = 'I7CgcV2K+8krkJdprJOIuamoveu9aP/Ytz/3nftcTKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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