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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbd0e69a6767714c29125e36b35f70788beb6f0bb7147dd0169e7fc562d885a' 
  AND token = 'n7muaxaDHBJ8rurzZIOkBAsX2eODf36fw3sE26Z835E=' 
  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"
    }
  }
}