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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e3ed85b137247d7be4ac803483b2550f98c99c2bcd29557c7dd90859993775' 
  AND token = '7A5M3ZS8zv4Y1rupppdtpZEQ+5Vr20Kg3XQzMDQcrDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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