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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57df61b919daf9577c708c79b88bd69f402e1f05a697d9f12b5c98704a4498a' 
  AND token = 'A4GhDLnhAnbIaz0Xj3M+14za+9u9TRa3jKnnVGFRrwE=' 
  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"
    }
  }
}