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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950f34a2e403c8c8a6837ad663c99ebd1b149a9b1fd589184def9813e8ac89bb' 
  AND token = 'p/735iN7AKQiqaDAYeLx9u9u4y4l54nZn5oRnLLFO+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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