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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077bf484cad34ec5879b867be6096ebd976b4deb644480686ab22ee2f76acf04' 
  AND token = 'pAmypeEK0/oRF40HYY5BYUfrERFJ74Is9I8/zdxIEEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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