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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8c0b95af628740bba79e425d45fe8841f79f9e1d8c81f182f05037f5f68161' 
  AND token = 'lf7MnGMbFWONtdzgTnWeGj9xOH59yE9BGyfULVkNMAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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