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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3c423ea889ebcfcb54b25d28e5d798bacd0c4f559ffc8704368c0b96bbb523' 
  AND token = '1Q4HwNCgajSdL1DCEul+bbPNxg9S5e7TZuUovXEYjiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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