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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0830e46b3343fa8ccf5c6ac1b7f04db2e8e4342e2550a6fc7e5161dd185cf3' 
  AND token = 'sT7CTBhvm9HLpxW4otYDwFf39bHl0MWDasZFngOEB/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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