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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6d1aceed8481c8e5ae2d7f77a59405ed69ed1f36c6fb010d8ece079f5c1414' 
  AND token = 'E4xVG7pg0V8gpGd9rZGSMMUlgobT3KoBQwERNFM1cBA=' 
  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"
    }
  }
}