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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed6660c5f26d9722b231e03cb41d522969a62f342b2c6d9ebb1f70ecb87b98f' 
  AND token = 'p/Bin5wBkmt2h7ro5ei1rI7ywFsfeLlqxseucGEr4MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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