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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82cd7e9f3b1aed1ba565c3fb1ea0fd06bdafad9e5f16acd45304602767f7fb08' 
  AND token = 'rlV7rU9X+ysaszD+Kt5X2Yi7Ze1XXA7dEergj0PfTxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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