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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f49e4df62ee77a2d03de78cabbee7ce2cf1587f28baf72792c424bb03ebe1e' 
  AND token = '+eSm+QSP4nfwdET5WaaTPDMR6vlTe7O7V0A3bt2pQ1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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